Grindstone Running Festival by Utmb

Verona, United States • 19-21 Sep 2025

Grindstone Running Festival by UTMB is a trail ultramarathon event held at Natural Chimneys Park near the Shenandoah Valley in Virginia. The festival offers four distances—100M, 100K, 50K, and 21K—tracing routes through the George Washington and Jefferson National Forest with steep climbs, ridges, valleys, and dramatic fall foliage. Runners experience a highly technical course featuring mountain views and diverse wildlife, set against the backdrop of peak autumn scenery. The event serves as a dual qualifier for the UTMB World Series Finals and Western States Endurance Run. Finisher rewards, race shirts, medals, and post-race meals accompany registration, along with Running Stones toward UTMB index and Mont-Blanc lottery. Visit the organization's website for the most recent information.

Race information

UTMB 20K UTMB 50K UTMB 100K UTMB 100M
167 km
6400 m+
100m
100 km
3350 m+
100k
50 km
1550 m+
50k
21 km
500 m+
21k
Visit the organization's website for the most recent information.
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